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They are still holding up well- I added center braces a long time ago, they really needed it.
I think I'd put a piece of 1/2" plywood under them next time, just to be extra safe.
My flow rate is lower than desired, because I don't have enough pump on them. I was planning on putting a power head in each one that ran the water back to the other end, but never got around to it.
Zeph
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